year nine chemistry crossword

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Across
  1. 4. Elements that do not form positive ions.
  2. 6. An old model of the atom, proposed by JJ Thompson. It was a ball of positive charge, with electrons dispersed inside it.
  3. 9. 2 or more different elements, in fixed proportions, chemically bonded together.
  4. 10. A substance containing a single type of atom.
  5. 12. Atoms of the same element with different numbers of neutrons
  6. 13. 2 or more different elements or compounds, which can be separated by physical means.
  7. 14. The vertical columns of the periodic table
Down
  1. 1. A reaction where a more reactive element displaces (replaces) a less reactive element from its compound e.g. Iron + Copper sulphate  Copper + Iron sulphate
  2. 2. A charged particle formed when an atom has lost or gained electrons.
  3. 3. Elements that react to form positive ions.
  4. 5. The model of the atom proposed by Rutherford. A small, dense, positive nucleus is in the centre, and electrons orbit this.
  5. 7. The total number of protons and neutrons in the nucleus of an atom.
  6. 8. The horizontal rows of the periodic table.
  7. 11. The number of protons in the nucleus of an atom. Also called proton number.